Being a stablecoin does not mean it will have a fixed value over time, but it won't be even close to the volatility you see on the other cryptocurrencies. GOLD is backed by physical real gold and is pegged to the spot price of Gold as Digital Gold is also providing liquidity for it aka doing market making and supporting the buying pressure to maintain a stable value. You can see the spot, purchase and redemption price through the Digital Gold gateway on their website: https://gold.storage/en/market